20803945 has 8 divisors (see below), whose sum is σ = 25770240. Its totient is φ = 16106160.

The previous prime is 20803943. The next prime is 20803949. The reversal of 20803945 is 54930802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20803945 - 2¹ = 20803943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (20803943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66955 + ... + 67264.

It is an arithmetic number, because the mean of its divisors is an integer number (3221280).

Almost surely, 2^20803945 is an apocalyptic number.

It is an amenable number.

20803945 is a deficient number, since it is larger than the sum of its proper divisors (4966295).

20803945 is a wasteful number, since it uses less digits than its factorization.

20803945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134255.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20803945 is about 4561.1341791269. The cubic root of 20803945 is about 275.0311590038.

The spelling of 20803945 in words is "twenty million, eight hundred three thousand, nine hundred forty-five".